When you are at the steam store you can select the game and it will tell you its size.
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The size of the download for Minecraft is 258 KB.
2.8 gigs for standard resolution, and i dont recall HD resolution but it was a little higher. it will tell you the size of your download before you download it.
There is a download in which you can get 64 player size maps. Here's the link. http://www.fileplanet.com/156004/download/Battlefield-2---Single-Player-64-Maps-Mod There are also websites, forums etc in which "hackers" have found ways in which you can get 64 player size maps. It is tricky though and it's probably a better idea if you download them but if you can't download you can try that.
It all depends on what size of games your playing.
The amount of megabytes that are used to download an app or application will vary depending on the size of the application. Each individual app is a different amount of megabytes.